Transport of Mixture of Cohesive and Non-cohesive Sediments in Rivers

A special issue of Water (ISSN 2073-4441). This special issue belongs to the section "Water Erosion and Sediment Transport".

Deadline for manuscript submissions: 20 February 2025 | Viewed by 146

Special Issue Editor


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Guest Editor
Retired Research Scientist, National Water Research Institute, Environment Canada, Burlington, ON, Canada
Interests: river dynamics; cohesive sediment transport; environmental hydraulics; mathematical modelling; diffusion and dispersion processes; water quality
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Special Issue Information

Dear Colleagues,

River sediment is generally composed of a mixture of fine-grained cohesive sediment (particles finer than 62 microns in size) and coarse-grained non-cohesive sediments (particles coarser than 62 microns in size). Cohesive sediments are derived from the overland and tributary in flows, as well as river-bank erosion. The non-cohesive sediment fractions are normally found in the riverbeds. The transport characteristics of cohesive and non-cohesive fractions are very different: cohesive sediment fractions normally undergo flocculation, as they are subjected to the river flow field, whereas the non-cohesive fraction behaves as individual particles. Critical conditions for erosion and deposition for the two types of sediments are also very different. While there is extensive research on these two types of sediment individually in the literature, research on the transport characteristics of the mixture of these two sediment types is limited. To highlight current research on the transport and mixture of cohesive and non-cohesive sediment fractions in river flows, we are assembling a Special Issue to publish high-quality research papers in this area of research. We are encouraging researchers in this field to submit their original research articles and review papers outlining their progress in this area to this Special Issue.

Dr. Bommanna Krishnappan
Guest Editor

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Keywords

  • cohesive sediment
  • non-cohesive sediment
  • transport of sediment mixture
  • river flows
  • erosion and deposition
  • flocculation
  • critical conditions

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Published Papers (1 paper)

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Research

19 pages, 4037 KiB  
Article
Applying Photoelectric Sand Meter for Monitoring of Suspended Solid Matter in Rivers
by Ximing Zhang, Maocang Niu, Jianmin Sun and Lixin Yi
Water 2025, 17(1), 26; https://doi.org/10.3390/w17010026 - 26 Dec 2024
Abstract
River ecosystems are integral to sustainable environmental development, playing a crucial role in understanding suspended solid matter (SSM) transport dynamics and soil conservation. Accurate monitoring of SSM concentrations in watersheds is foundational for these studies. This research introduces and evaluates a novel HHSW·NUG-1 [...] Read more.
River ecosystems are integral to sustainable environmental development, playing a crucial role in understanding suspended solid matter (SSM) transport dynamics and soil conservation. Accurate monitoring of SSM concentrations in watersheds is foundational for these studies. This research introduces and evaluates a novel HHSW·NUG-1 photoelectric sand meter, specifically designed for SSM measurement. Its reliability was validated at three hydrological stations, including Xiaolangdi. The instrument, based on light scattering principles, is optimized for environments with high SSM loads and rapid flow rates. Laboratory tests indicate a measuring range of 0 to 730 kg/m3, and field trials show effective operation within 0 to 375 kg/m3, meeting the monitoring needs of hydrological stations. Through comparative analysis of measurement data, we established conversion relationships for various SSM concentration ranges, confirming that the instrument’s system error is less than 1%. The photoelectric sand meter adheres to standards outlined in the “Guidelines for SSM Test in Rivers”, demonstrating stability in reliability, calibration methods, observation accuracy, real-time monitoring, data storage, and continuous operation. For optimal use, adherence to relevant hydrological instrument standards is recommended, particularly in stations requiring SSM analysis. Standard sampling and calibration of conversion coefficients should be conducted, and proper sensor installation is crucial to avoid interference from flow conditions. In conclusion, the HHSW·NUG-1 optoelectronic sand meter exhibits stable and reliable performance in practical applications, with broad potential for rapid deployment in other river hydrological stations. Full article
(This article belongs to the Special Issue Transport of Mixture of Cohesive and Non-cohesive Sediments in Rivers)
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